Bidens tripartita. 
Trifid Hemp-Agrimony. 
BIDENS Lin. Gm. Pl. Syngenesia Polygamia jEqj'alis. 
Rrccpl. paleaceum. Pappus ariftis ereSis fcabris. Cal. imbncatus. Cor. rarius 
fiofculo uno alterne radiante inftruitur. 
Rail Syn. Gen. 8i Herbje flore composito discoide seminibus pappo destitutis 
corymbifera dicta. 
BIDENS tripartita foliis trifidis, calycibus fubfoliofis feminibus eredis. Lin. Syjl. Vegetab. p. (no. 
Sp.Pl.nby. Fl.Succ. 283. Lappan. p. 234. 
BIDENS foliis petiolatis tribbatis et quinque lobatis ferratis floribus circumvallatis. Hahcr Hjjl. n. 121. 
BIDENS tripartita. Scop. FI. Carn. n. 1090. 
VERBESINA feu Cannabina aquatica flore minus pulchro, elatior et magis frequens. J. S. II. io;3- 
CANNABINA aquatica folio tripartito divifo. Bauh. pin. 321. 
EUPATORIUM cannabinum foemina, Ger. emac. jn. 
EUPATORIUM aquaticum duorum generum. Parkinf. p. 595. Raii Syn , p. 187. Water Hemp- 
Agrimony, with a divided Leaf. Hudfon. FI. Angl. cd. 2. p. 355. Light] oot 
FI. Scot. p. 461. 
RADIX annua, fimplex, fibrofa, fibris albidis. 
CAULIS pedalis ad tripedalem, eredus, ramofus (ramis 
oppofitis), teretiufculus, modice fulcatus, ru- 
bens, folidus, glaber, fcabriufculus. 
FOLIA oppofita, petiolata, connata, glabra, tripartita, 
aut etiam quinque partita, laciniis profunde 
ferratis, fuprema indivifa, dentato-ferrata, aut 
etiam integra, pilis haud infrequenter ciliata. 
FLORES lutei, terminales, fubnutantes. 
CALYX : Foliola plura, plerumque integra, lanceo- 
lata, ciliata, flores involucri inftar ambientia ; 
fquamie calycis communis ovato lanceolate, 
integre, lineis plurimis, nigricantibus, paral- 
lelis, piCtse, marginibus flavefcentibus. Jig. 1. 
COROLLULiE hermaphrodite, tubulofe, infundibuli- 
formes, lutee, ftriis quinque purpureis externe 
notate ; limbo quinquefido, fubereCto. jig. 2. 
STAMINA : Filamenta quinque capillaria ; An- 
ther a in tubum cylindricum coalite. Jig. 3. 
PISTILLUM : Germen fubcompreflum, angulatum. 
fuperne latius, ariftis tribus plerumque inftruc- 
tum, unica breviore ; Jig. 3. Stylus fimplex, 
longitudine flaminum ; Stigmata duo ob- 
longa, reflexa. Jig. 4, 5. 
SEMEN oblongum, compreflum, angulatum, fufcum, 
ariftis duabus feu tribus retrorfum fcabro ha- 
matis inftru&um. Jig. 6. 
RECEPTACULUM paleaceum, planum, paleis lan- 
ceolato-linearibus, lineatis, deciduis. Jig. 7. 
ROOT annual* Ample and fibrous, fibres whitilh. 
STALK from one to three feet high, upright, branched, 
(the branches oppofite), roundifh, moderately 
grooved, of a reddifh colour, folid, fmooth 
to appearance, but flightly rough to the touch. 
LEAVES oppofite, ftanding on footftalks, which unite 
at the bafe, fmooth, divided into three, and 
fometimes five fegments, which are deeply 
ferrated, the uppermoft leaves undivided, either 
indented at the edge, or entire, and not un- 
frequently edged with hairs. 
FLOWERS yellow, terminal, drooping a little. 
CALYX : feveral, fmall, lanceolate leaves, generally 
entire, but edged with hairs furrounding the 
flowers like an involucrum ; the fcales of the 
calyx common to all the florets are ovate and 
pointed, entire at the edge, and painted with 
numerous blackilh lines, the edges are yel- 
lowilh. Jig. 1. 
FLORETS hermaphrodite, tubular, funnel-fhaped, of 
a yellow colour, marked externally with three 
purplilh ftripes, the limb divided into five feg- 
ments, which are nearly upright. Jig. 2. 
STAMINA: five capillary Filaments; Anthera 
united into a cylindrical tube. Jig. 3. 
PISTILLUM : Germen flattifli, angular, broadefl: at 
top, generally furniftied with three awns, of 
which one is fhorter than the reft; Jig. 3. 
Style Ample, the length of the ftamina ; 
Stigmata two, oblong, turning back .Jig. 4,5. 
SEED oblong, flat, angular, brown, furniftied with two 
or three awns, which are hooked or barbed 
downward. Jig. 6. 
RECEPTACLE chaffy and flat, fcales or chaff, narrow, 
marked with lines and deciduous. Jig. 7. 
This fpecies of Bidens is much more common than the cernua , as that is generally found in the water, this more 
frequently occurs on the borders of ponds, rivulets, &c. where it flowers in the months of Auguft and September, 
at the clofe of which it ripens its feeds. 
It is obvioufly diftinguifhed from the cernua by having its leaves, for the mod part, divided into three feg- 
ments, whence its name ; this character is more to be depended on than the uprightnefs of its flowers, as they 
generally droop a little when the plant is in perfection. 
Linnaus, and other writers, recommend it as a plant that will dye both linen and woollen of a yellow colour, 
for this purpofe the yarn or flax muft be firft fteeped in allum-water, then dried and fteeped in a decoCtion of the 
plant, and afterwards boiled in the decoCtion. Haller. FUJI. Helv. p. 52. 
